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The Crystal Structures of Three Azonaphtharylamide Pigments by Chia-Hsien Chang; Robert M. Christie; Georgina M. Rosair is a Materials Science article available to read on EtoBox.

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The single crystal X-ray structures of three structurally related azonaphtharylamide pigments are reported. Two azo pigments derived from 4-amino-3-nitrotoluene as diazo component ( 1a andb) crystallize in the centrosymmetric space group P2 1 /c while the third (1c), an analogue of 1b but derived from 2,5-dichloroaniline as diazo component, crystallizes in the chiral space group P2 1 2 1 2 1 . The compounds adopt the ketohydrazone tautomeric forms with intramolecular, but no intermolecular, hydrogen bonding. The application performance of the products is discussed in relation to the molecular and crystal structures. X-ray powder diffraction, supported by FTIR spectroscopic and DSC analysis, demonstrate that pigment 1a shows polymorphism. The application performances of the two polymorphs of this pigment are compared.

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Author

Chia-Hsien Chang; Robert M. Christie; Georgina M. Rosair

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0143-7208)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)